[LMB] Lois-Bujold Digest, Vol 164, Issue 15

Baur baur at chello.at
Sun Jan 13 16:07:29 GMT 2019

sounds like a H4 bulb for cars (high beam / low beam in the same bulb)



Am 13.01.2019 um 16:54 schrieb Howard Brazee:
>> On Jan 13, 2019, at 8:44 AM, Baur <baur at chello.at> wrote:
>> what is a 3-way bulb?
> I have a lamp with a twist switch that rotates between off, dim, medium, and high.   I uses light bulbs that have two separate filaments.   It’s really having 3 different light bulbs in one (combining 2 of the filaments gives the brightest light).    If I look at the bottom of the bulb, I see it has separate contacts so the electricity goes in differently for the interior lights.    One filament can burn out, leaving one of the third brightnesses working.
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